Sewing machine



Feb. 13, 1934. 1 G, RUSSELL 1,947,436

SEWING MACHINE Original Filed Deo. 9. 1929 3 sheets-sheet 1 ATTORNEY l Fb. 13, 1934. J. G. RUSSELL SEWING MACHINE original Filed Deo. 9, 1,929

3 Smeets-Sheet 2 INVENTOR f7 Q/ `36 BWK?? ATTORNEY Feb. 13, 1934. J, G, RUSSELL 1,947,436

SEWING MACHINE Original Filed Dec. 9, 1929 3 Sheets-Sheec. 3 u

INVENTOR ATTORNEY Patented Feb. 13, 1934 UNITED l STATES SEWING Julian Guy Russell, North Chattanooga,

assgnor, by mesne MACHINE Tenn.,

assignments, to Carter Brothers, Incorporated, Chattanooga, Tenn., a corporation of Tennessee Original application December 9,1929, Serial No. 412,821, and in Great Britain May 27, 1931.

Divided and this application September 1932. Serial N0; 631,907

4 Claims.

This invention relates to fabric feeding mechanism for sewing machines and the like, more particularly to fabric feeding means of the character shown in my prior application, Serial No. 412,821, led December 9, 1929, of which the present application is a division.

The invention has for its object to provide an improved means for varying at will the length of stitches formed by the needle, such means comprising a yoke which may engage any one of a plurality of cams of different dimensions carried or actuated by the main shaft of the machine. The invention will be described with reference to the accompanying drawings, wherein a preferred embodiment of the invention is shown and where- Fig. 1 is a side elevation of a sewing machine embodying the invention, the enclosing means or work support being removed.

Fig. 2 is a horizontal section of a part of the sewing machine below the presser foot and throat plate.

Fig. 3 is a transverse vertical section on an enlarged scale on line 3-3 of Fig. 2.

Fig. 4 is a perspective view of the yoke mechanism for varying the length of the stitches.

Fig. 5 is a perspective view, on an enlarged scale, of the throat plate.

The mechanism embodying the present inven-V tion is shown as applied to a well-known type of sewing machine. As illustrated, the machine includes the usual supporting bed or base 5 (Fig. 1), an upwardly and outwardly projecting xed arm or goose neck 6 having a head 7 at the left or forward end thereof and a main shaft 8 extending longitudinally of the bed and through the lower portion of the arm 6. A driving pulley 9 is mounted on a portion of the shaft 8 which extends to the right beyond the arm 6, and an eccentric 10 is mounted on the shaft adjacent the driving pulley 9. The eccentric 10 is provided with a connecting rod 1l attached to a rocker arm 12 fulcrumed on one side of the fixed arm Y. or goose neck 6, as at 13, and having its other end clamped or otherwise secured to a needle bar 14, reciprocatingly mounted in the head 7. As usual, the needle bar 14 carries at its lower end a movable needle 15. The mechanism also embodies a presser foot "bar 16 provided with means for raising and lowering the bar. A presser foot 17 at the lower end of the bar 16 is of essentially the usual form. The presser foot 17 is disposed to co-operate with a throat plate 18 (Fig. 5) removably mounted v'in a work support 19, the said work support serving also to cover the mechanism and. to protect the same from dust, dirt and the like. In Figures 1 and 2 the work support and throat plate have been omitted so as to more clearly show the co-operation of the various parts of the mechanism.

The sewing machine structure includes a feed arm 20, clearly illustrated in Figs. 2 and 3, which arm is hinged at its rear end 127 to the hinge member of a frame 21, .which frame I have termed a rocker support. This frame 21 or rocker support is itself hinged at its lower portion-as at 128, as illustrated in Fig. 3, so as to be free to move forwardly and rearwardly. The feed arm 20 may be swung upwardly and downwardly with reference to the rocking support or frame by any suitable means co-operating with the main drive ,shaft 8. As shown in Fig. 3, an angularly bent strip 96 is secured to the under side of the arm 20 and has a horizontal portion 97 extending beneath a cam 98 on the shaft 8. The arm 20 and the horizontal portion 97 of the strip 96 thus form a yoke, which embraces the cam 98, whereby a swinging upward and downward movement is imparted to said arm. vIf desired, lubricating material 95 may be provided for oiling the mechanism.

To impart forward and rearward movement to the feed arm 20, means are provided for swinging the rocking support or frame 21 aboutthep'intle 128. As shown in Figs. 2 and 4 the rocking frame 21 is provided with a lateral extension 129, enlarged as at 130, on which enlargement a yoke, generally designated as 22, is mounted in such manner as to permit the yoke to swing about a vertical pivot 131.

By reason of this pivoted connection, the yoke 22 may be swung to engage any one of a plurality of cams 23, 23a and 23h, mounted on one end of the main driving shaft 8.

The purpose of this yoke adjustment is to vary the stroke of the feed arm 20 and thus vary the extent of feed, dependent on the length of stitching desired.

As shown in Fig. 4 the yoke includes a forwardly extending bar 132 which is bent downwardly so as to fit under one of the cams as indicated at 133, and said bar at its forward end is bent upwardly at 134, ending in a bifurcation 135. Hinged to the bar 132 at.136 is a co-operating member 137 of the yoke which extends over the proper cam member, and the forward end of the member 137 extends into the bifurcation 135. For holding the member 137 in position, an arm 138 is pivotally mounted as at 139 in the bifurcation cciy lio

so as to permit the yoke as a whole to be swung-V about the pivot 131 into engagement with any of the cams 23, 23u, or 23h. f

A flat spring 142 is provided for adjustably and yieldingly holding the yoke in operative position relative to one of the cam members, which spring may be secured to a head 143 on the exetension 129 of the rocking support 21. This spring 142 carries at the opposite end a bar 14e which is provided with a plurality of grooves 145, 145m and 145i), corresponding, respectively, to the cams 23,

23a and 23h. This bar exerts a yielding pressure upon the lower arm 132 of the yoke member, which may be suitably engaged in any one of the grooves, according to the length of stitching desired. The effect of the cams 23, 23a and 23h is to move the yoke 22 up and down, which motion is transmitted through the enlargement 130 and extension 129 to the rocking support 21, so that the feed arm 20 will be moved forwardly and rearwardly at regular intervals, while at the same time the cam 98, previously described, serves to raise and lower the arm 20, thus imparting movement in four directions to the feed arm.

The feed arm 20 carries toothed or serrated feeders 2li working through the throat plate 18 in the manner usual in sewing machines, the said feeders being parallel and separated by a channel or throat 25.

The stroke of the feeders 24 may be varied as desired by engaging the yoke 22 with any desired one of the cams 23, 23a or 2317.

Having now particularly described and ascerf f' tained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim ist- 1. In a tufting machine comprising a base, a power shaft, a reciprocating needle actuated by said shaft, and a fabric feeder intermittently movable transversely of the direction of movement of said needle, means for actuating said fabric feeder, said means comprising a frame mounted to rock on said base on an axis at substantially a right angle to the direction of movement of the needle, an arm supporting the fabric feeder and pivotally connected to said frame, means actuated by said power shaft for imparting vertical movement to said feeder supporting arm, a plurality of cams of different eccentricities rotatable on a common axis outwardly of one end of said base and actuated by said power shaft and `a yoke pivotally connected to said frame on an axis substantially parallel to the direction of movement of the needle and selectively engageable with any one of said cams for varying the length of horizontal movement of said feeder supporting arm.

2. In a tufting machine according to claim 1 wherein yieldable means associated with the frame engages the yoke for holding the yoke in engagement with any one of the cams.

3. In a tufting machine including a reciprocating needle, a frame mounted to rock on an axis substantially normal to the direction of movement of said needle, a fabric-feeding arm hinged to said frame for vertical movement and means for intermittently raising and lowering said arm, variable means for reciprocating the fabric-feeding arm transversely of the direction of movement of the needle, said means comprising a plurality of rotatable cams of diiferent eccentricities and a yoke hinged to the frame on an axis at a right angle to the rocking axis of the latter and movable into position to straddle any one of said cams.

4. In a tufting machine including a reciprocating needle, a frame mounted to rock on an axis substantially normal to the direction of movement of said needle, a fabric-feeding arm hinged to said frame for vertical movement and means for intermittently raising and lowering said arm, variable means for reciprocating the fabric-feeding arm transversely of the direction of movement of the needle, said means comprising a plurality of rotatable cams of diierent eccentricities and a yoke hinged to the frame on an axis at a right angle to the rocking axis of the latter and movable into position to straddle any one of said cams, said yoke comprising a pair of hingedly connected members and yieldable means carried by the frame and engaging one of said members for maintaining said yoke in engagement with any one of said cams.

JULIAN GUY RUSSELL. 

